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https://issues.apache.org/jira/browse/LUCENE-5352?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13835460#comment-13835460
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Adrien Grand commented on LUCENE-5352:
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I ran tests as well and got similar results.
It may be possible to optimize this reader (maybe reversing the bytes in the
call to readLong takes substantial time on little-endian computers (just
guessing)?) but taking a step back, I'm wondering that maybe this aligned
format should be deprecated. As [~toke] noted last year, the in-memory impl is
not faster than Packed64 on all CPUs, so if the speed-up is not clear for
disk-based structures either, I think we should just deprecate it?
> PackedInts.fastestFormatAndBits returns slower format for Direct
> ----------------------------------------------------------------
>
> Key: LUCENE-5352
> URL: https://issues.apache.org/jira/browse/LUCENE-5352
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Robert Muir
>
> from some simple testing, DirectPacked64SingleBlockReader seems slower than
> DirectPackedReader (at least in a few cases i tested, more testing needed,
> but look at the code).
> this is unintuitive, because by passing e.g. FASTER you are making it slower.
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